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    <title>Document</title>
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    <div>
      <div id="test">盒子1</div>
    </div>
    <div id="test2">r1</div>
    <div id="test3">
      <div>d1</div>
      <div>d2</div>
      <div>d3</div>
    </div>
    <div id="test4" class="t4">
      <div>选择</div>
    </div>
    <div id="test5">
      <div>q1</div>
      <div id="test6">q2</div>
      <div>q3</div>
    </div>

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